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authorAlexander Aring <aring@mojatatu.com>2018-04-20 21:15:05 +0200
committerDavid S. Miller <davem@davemloft.net>2018-04-23 03:12:00 +0200
commitd57493d6d1be26c8ac8516a4463bfe24956978eb (patch)
tree5386270f315c29fb679d6247f53eae936656fbd4 /net
parentnet: sched: ife: handle malformed tlv length (diff)
downloadlinux-d57493d6d1be26c8ac8516a4463bfe24956978eb.tar.xz
linux-d57493d6d1be26c8ac8516a4463bfe24956978eb.zip
net: sched: ife: check on metadata length
This patch checks if sk buffer is available to dererence ife header. If not then NULL will returned to signal an malformed ife packet. This avoids to crashing the kernel from outside. Signed-off-by: Alexander Aring <aring@mojatatu.com> Reviewed-by: Yotam Gigi <yotam.gi@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ife/ife.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ife/ife.c b/net/ife/ife.c
index 7fbe70a0af4b..13bbf8cb6a39 100644
--- a/net/ife/ife.c
+++ b/net/ife/ife.c
@@ -69,6 +69,9 @@ void *ife_decode(struct sk_buff *skb, u16 *metalen)
int total_pull;
u16 ifehdrln;
+ if (!pskb_may_pull(skb, skb->dev->hard_header_len + IFE_METAHDRLEN))
+ return NULL;
+
ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
ifehdrln = ntohs(ifehdr->metalen);
total_pull = skb->dev->hard_header_len + ifehdrln;